NONOS

The Open Source Smart Speaker

Premium Sound • Privacy First • Fully Hackable

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🎵 Experience Audio Freedom

NONOS is a premium smart speaker that puts you in control. It delivers exceptional sound quality while respecting your privacy, and its hardware is described declaratively in lightweight .ato files.

✨ Key Features

🔊 Audiophile-Grade Sound Dual-driver system with dedicated tweeter and full-range speaker Texas Instruments TAS5825M Class-D amplifier Analog Devices ADAU145x DSP for pristine audio processing I2S digital audio interface for lossless playback	🧠 Powerful Computing Raspberry Pi CM5 module at its heart Gigabit Ethernet connectivity USB-C with Power Delivery support Multiple I2C, UART, and GPIO interfaces
🎨 Interactive Design 23 SK6805 addressable RGB LEDs Capacitive touch controls with volume slider NFC tap-to-pair functionality Minimalist cylindrical form factor	⚡ Smart Power Management USB-C Power Delivery (20V input) Efficient buck converters (5V & 3.3V rails) STUSB4500 PD controller Low standby power consumption

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🎶 Software Features

Streaming Services

Connect and play from all your favorite sources:

• Spotify Connect - Stream directly from the Spotify app
• AirPlay - Native support for Apple devices
• Bluetooth Audio - Auto-pairing A2DP streaming
• Local Playback - Play your music library via network shares

Smart Controls

Intuitive touch interface with gesture support:

• Play/Pause - Center button for media control
• Track Navigation - Skip tracks or seek within songs
• Volume Slider - 5-position touch slider with double-tap gestures
  • Double-tap position 0 for mute
  • Double-tap position 4 for +6dB boost
• Configurable EQ - 15-band parametric equalizer

Audio Excellence

Professional-grade DSP processing:

• Crossover Networks - Optimized for dual-driver configuration
• Dynamic Range Control - Independent limiting for highs and lows
• Mid-Side Processing - Adjustable stereo width
• PipeWire Integration - Low-latency audio with automatic resampling

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🎛️ Hardware Highlights

Audio Processing Pipeline

CM5 (Digital Audio) → I2S → ADAU145x DSP → I2S → TAS5825M Amplifier → Speakers

Interactive Hat Module

• NFC: PN5321 for instant device pairing
• Touch: CAP1188 capacitive sensor (3 buttons + 5-position slider)
• LEDs: 23x SK6805 RGB LEDs in a circular array
• Level Shifting: Ensures reliable 3.3V/5V communication

Debug Headers

Three Saleae-compatible headers for easy development:

• UART console access
• I2C bus monitoring
• I2S audio stream analysis

Printed Circuit Boards

Mainboard

• atopile module: NONOS (elec/src/nonos.ato)
• USB-C Power Delivery input via STUSB4500 (up to 20 V)
• Power tree: TPS54560x 5 V buck ➜ TLV75901 3 .3 V LDO
• Raspberry Pi CM5 compute module
• ADAU145x audio DSP ➜ TAS5825M 2-channel Class-D amplifier
• 10-pin mezzanine connector to the Hat
• Connectors for full-range & tweeter speakers
• Three Saleae-compatible debug headers (UART, I2C, I2S)

Control Hat

• atopile module: Hat (elec/src/hat.ato)
• PN5321 NFC transceiver with custom button-antenna
• CAP1188 capacitive touch sensor (3 buttons + 5-point slider)
• 23× SK6805 side-emitting RGB LEDs arranged in a ring
• 74LVC1T45 level-shifter for reliable 5 V LED data
• Powered from 3 .3 V (logic) & 5 V (LEDs) supplied by the mainboard
• 10-pin mezzanine connector mates directly with the mainboard

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🛠️ Hardware Design

The hardware is captured in concise .ato design files (powered by atopile).

module NONOS:
    """
    An opensource sonos era 100 clone
    """

    # Core Components
    cm5 = new CM5
    amplifier = new Texas_Instruments_TAS5825MRHBR_driver
    dsp = new Analog_Devices_ADAU145x_driver
    pd_controller = new STUSB4500

    # Smart Power Distribution
    pd_controller.power_out ~ power_20v
    power_20v ~> regulator_5v ~> power_5v
    power_5v ~> regulator_3v3 ~> power_3v3

📁 Project Structure

nonos/
├── elec/
│   └── src/
│       ├── nonos.ato      # Main speaker module
│       ├── hat.ato        # Touch/LED/NFC interface
│       └── parts/         # Component library
├── firmware/              # CM5 software stack
├── mechanical/            # Enclosure designs
└── docs/                  # Build instructions

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🎚️ Audio Tuning

Using a calibrated reference microphone we swept each driver, loaded the recordings into Audacity to eyeball the bumps and dips, then built FIR/biquad filters in SigmaStudio and dialed-in a 2-way crossover with gentle EQ to flatten the combined response. The whole process took about 20 heroic minutes—roughly twice the time it looks like Sonos spends on some of their launch-day tunings 😉.

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🚀 Getting Started

Prerequisites

• atopile compiler installed
• KiCad 8.0 or later (for PCB viewing/editing)
• Basic SMD soldering equipment

Building NONOS

1. Clone the repository

   git clone https://github.com/atopile/nonos
   cd nonos

2. Compile the hardware design

   ato build

3. Generate manufacturing files

   ato build -t all

4. Order PCBs and components

   • Upload gerbers from /build to your preferred PCB manufacturer
   • Use the generated BOM for component ordering

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🤝 Contributing

We love contributions! Whether it's:

• 🐛 Bug fixes
• ✨ New features
• 📚 Documentation improvements
• 🎨 Design enhancements

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📄 License

NONOS is open source hardware, released under the MIT License. See LICENSE for details.

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🌟 Acknowledgments

Built with ❤️ using atopile - the language that's revolutionizing hardware design.

Special thanks to the atopile community for making hardware development accessible to everyone.

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Ready to build your own NONOS?

📖 Read the Docs • 💬 Join Discord • ⭐ Star on GitHub